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gas fireplace, where is the thermocouple?

Went on a call today for a blazeking pegasus 9300. Pilot won't stay lit. I removed the logs to gain access to pilot assy. The assy. only has a pilot hood, ignitor and a thermopile. What on this system holds the pilot valve open? Is the ignitor also a flame sensor? Does a thermopile ever double as pilot and main valve control?

Yes, the thermopile performs both the pilot safety and the main operator functions. There are many things that could be wrong here:
low inlet gas pressure
dirty pilot burner orifice
clogged primary air holes in pilot burner
pilot burner flame diverters not adjusted to TP
vent obstruction
logs out of place
secondary air ports in burner obstructed
poor connections
faulty snap discs in safety circuit
wiring faults in Th-Tp/TH circuit including faulty switch or too many switches (max 2), non-millivolt type thermostat (and that is only if this unit is listed for a stat)